One-step synthesis of nanostructured Ag₂Mo₂O₇ with enhanced efficiency for supercapacitors

Owing to the energy crisis and environmental pollution deterioration, people are working to develop new kinds of electrical energy storage systems. Bimetallic oxides have been considered potential candidates for supercapacitors (SCs) due to their relatively high electric conductivity and abundant redox reactions. Herein, we designed and synthesized nanostructured Ag₂Mo₂O₇ by the simple chemical route and further examined the sample with different kinds of spectral and analytical tools. The Fourier Transform Infrared Spectroscopy (FTIR) studies analyzed the different vibration and starching modes of metal oxide and the pure phase of the obtained Ag₂Mo₂O₇. The morphology nature of nanoflakes Ag₂Mo₂O₇ can be easily identified from field emission scanning electron microscopy (FE-SEM) can be observed. X-ray photon spectroscopy (XPS) studies the oxidation states of the Ag 3d, Mo 3d and O 1 s, which validates the XRD data. The as-prepared Ag₂Mo₂O₇ nanostructure was used as supercapacitor (SC) electrode material, and it exhibited pseudocapacitive performance with noticeable specific capacity (C_s) of 430 C g⁻¹ at 1 A g⁻¹ and significant cycling stability of 93.7% capacitance retention with the coulombic efficiency of 85.2% even up to 5000 GCD cycles at 1 A g⁻¹. The morphological investigations indicated that the higher C_s values were mainly caused by the significant increase in active sites as well as active surface area. The Bode phase angle plot of Ag₂Mo₂O₇ exhibited a low frequency intercept, with emphasis at approximately − 50.6° phase angle, which indicated a superior redox signature. The results infer that these highly electroactive binary metal oxide nanostructures are promising candidates for high performance energy storage applications.